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Finding the Fourth Proportional to 15,204.45, 20,978.43 and 8,915.61

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Solution

The fourth proportional to 15,204.45, 20,978.43 and 8,915.61 is: 12,301.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,204.45 : 20,978.43 = 8,915.61 : x
  2. Step 2: Convert to fraction form
    15,204.45/20,978.43 = 8,915.61/x
  3. Step 3: Cross multiply
    15,204.45x = 20,978.43 × 8,915.61
  4. Step 4: Simplify right side
    15,204.45x = 187,035,500.29
  5. Step 5: Solve for x
    x = 187,035,500.29/15,204.45
  6. Step 6: Final answer
    x = 12,301.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.